added stub componentWillUpdate() method to DatePicker component.  This will be used later.
added stub componentWillUpdate() method to DatePicker component.  This will be used later.

paulrenenichols/react-component-date-picker,paulrenenichols/react-component-time-input,paulrenenichols/react-component-time-input,paulrenenichols/react-component-date-picker